Collimate \Col"li*mate\, v. t. [imp. & p. p. Collimated; p. p. & vb. n. Collimating.]

[See Collimation.]

(Physics & Astron.) To render parallel to a certain line or direction; to bring into the same line, as the axes of telescopes, etc.; to render parallel, as rays of light.

Source: Webster's Revised Unabridged Dictionary (1913)